数字农科院2.0

A Novel Strategy Of Anti-Interference For Solid Dilution In Elemental Analysis Using Spontaneous Surface Dispersion Theory

文献类型： 外文期刊

作者： Wang, B; Liu, TP; Liu, JX; Mao, XF; Na, X; Chen, GY; Lv, ZH; Qian, YZ

作者机构：

期刊名称： ATOMIC SPECTROSCOPY

ISSN： 0195-5373

年卷期： 2020 年 41 卷 3 期

页码：

收录情况： JCR（2021版）

摘要： A novel idea of anti-interference via solid dilution driven by spontaneous surface dispersion (SSD) is herewith first rendered for elemental analysis to determine trace cadmium in a solid sample, which is similar to the spontaneous monolayer dispersion theory originally applied to heterogeneous catalysts at the percentage level. After pre-ashing with agitation, Cd in a solid sample can be efficiently and quickly diluted via SSD on alpha-Al2O3 support by heating at 600-700 degrees C for 30-40 min, thus leading to >180-fold dilution. Secondary ion mass spectrometry (SIMS) proved that the surface concentration of Cd on the alpha-Al2O3 support significantly increased, indicating that SSD occurred to Cd. The mechanism was thereby confirmed and then deduced. In essence, the proposed SSD is a dilution process for solid samples on the support's surface near Tammann temperature, where homogeneous monolayer or sub-monolayer coverage forms to reduce and even avoid contact of the target elements with interferent. The anti-interference effect has been completely verified via the matrix interference evaluation for Cd in a rice sample. In addition, SSD solid dilution consumes very little alpha-Al2O3 for solid sample analysis after ashing, and shows reliability, precision, simplicity, and is green chemistry. This SSD approach opens a novel horizon for anti-interference research in the elemental field of analytical chemistry.

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